Abstract
Summary
1. A sensitive, reproducible assay for properdin is described using spectro-photometric determinations of C'3 content. 2. RP and R3 reagent sera for the properdin assay may be readily prepared from guinea pig serum. 3. RP and R3 from both human and guinea pig sources may be used interchangeably in the reported properdin assay. 4. Tnu-lin was found to be more satisfactory than zymosan as a properdin binding and C'3 inactivating agent.
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